Police and the FBI are investigating suspicious packages sent to the home of Republican House candidate Karen Handel and several of her neighbors.

According to WSB in Atlanta, the authorities are going “mailbox to mailbox” after the discovery of a suspicious envelope with a “white powdery substance.”

Handel has been in the national spotlight for several months as part of a contentious and closely watched special election for a U.S. House seat against Democrat Jon Ossoff. She issued a statement addressing the packages sent to her home.

“This afternoon we had some suspicious packages delivered to our house and to our neighbors,” Handel said in the statement. “The packages contained threatening letters and a suspicious substance. The police were quickly notified and street is now being blocked off. We will continue to coordinate with law enforcement as necessary.”

The incident has understandably been of great concern to the Handel campaign, coming just one day after the shooting at a Republican Congressional baseball practice in Alexandria, VA. The assailant, James T. Hodgkinson, reportedly asked whether Republicans are Democrats were on the field before he opened fire.